Motorola Symbol LS9208 Product Reference Manual page 123

Bar code scanner

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RS-232 Interface

When this option is selected, after transmitting data, the scanner expects either an ACK or

NAK response from the host. When a NAK is received, the scanner transmits the same data

again and waits for either an ACK or NAK. After three unsuccessful attempts to send data

when NAKs are received, the scanner issues an error indication and discards the data.

The scanner waits up to the programmable Host Serial Response Time-out to receive an

ACK or NAK. If the scanner does not get a response in this time, it issues an error indication

and discards the data. There are no retries when a time-out occurs.

When this option is selected, the scanner waits for an ENQ character from the host before

transmitting data. If an ENQ is not received within the Host Serial Response Time-out, the

scanner issues an error indication and discards the data. The host must transmit an ENQ

character at least every Host Serial Response Time-out to prevent transmission errors.

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